Here's the list so far, I will be adding as it is released.
Improved Shadow Bolt – this talent now provides a 5% spell critical strike buff (similar to Improved Scorch).
Improved Soul Leech – this talent now provides Replenishment (similar to shadow priests)
Drain Soul now has a chance to produce Soul Shards even if the target doesn't die.
Siphon Life no longer as an active ability but the talent grants the old Siphon Life effect to Corruption.
*note* I have a bit of trouble understanding the one above. The Siphon Life talent will add the effect of Siphon Life to Corruption... cant wait to read more on this.
Curse of Recklessness and Curse of Weakness have been combined into one spell
Consume Shadows – this Voidwalker ability is no longer channeled but has a cooldown.
Several other warlock talents have had their ranks reduced, their effects changed or removed. This list includes but is not limited to Demonic Empathy, Shadow Embrace, Eradication, Suppression, and Pandemic.
Additional new talents have been added.